Oct 24 (Reuters) - Cathay Pacific Airways Ltd said on Wednesday that data of about 9.4 million passengers of Cathay and its unit Hong Kong Dragon Airlines Limited had been accessed without authorisation.

"We are very sorry for any concern this data security event may cause our passengers," Cathay Pacific Chief Executive Rupert Hogg said in a statement.

"We acted immediately to contain the event, commence a thorough investigation with the assistance of a leading cybersecurity firm, and to further strengthen our IT security measures."

Hogg said no passwords were compromised in the breach and the company was contacting affected passengers to give them information on how to protect themselves.

Cathay Pacific was not immediately available for additional comment outside normal business hours.

The company said it initially discovered suspicious activity on its network in March 2018 and investigations in early May confirmed that certain personal data had been accessed.

News of Cathay's passenger data breach comes weeks after British Airways revealed that credit card details of hundreds of thousands of its customers were stolen over a two-week period.(https://reut.rs/2oUTNrU)